raychem circuit protection, a unit of tyco electronics corporation, introduces the lvr series of polyswitch resettable devices. designed for use in line voltage applications, the lvr series pptc (poly- meric p ositive temperature coefficient) devices are rated at 240v ac , permitting maximum voltages of up to 265v ac , and are available in hold currents from 50 to 550ma. the lvr series extends the proven polyswitch technology of resettable over- current protection into higher voltage applications. when installed in proximity to potential heat generating components such as magnetics, fets, or power resis- tors, the thermally active devices can help protect against both overcurrent and overtemperature faults in power sup- plies, transformers and control circuits. the properties of the lvr device can offer distinct benefits in transformer protection designs. the surface tem- perature of the lvr device in the high resistance state is well within the range of most transformer winding insulation ratings. this low temperature operation, combined with small size, low resistance and good thermal shock tolerance, can allow the lvr device to be mounted in direct contact with the transformer wind- ings for a faster response to potential fault conditions. polyswitch lvr series resettable protection devices lvr line voltage series of polyswitch devices for ac line voltage applications benefits: helps reduce warranty, service and repair costs helps provide overcurrent and overtemper- ature protection low surface temperature in high resistance state helps provide an effective solution for protection of transformer windings assists in meeting regulatory requirements compatible with high-volume electronics assembly features: maximum operating voltage of 240v ac maximum interrupt voltage of 265v ac hold currents from 50ma ?550ma ul, csa, and t?v (iec) recognized solid-state: able to withstand mechanical shock and thermal stress low off state resistance target applications: cell phone chargers appliance (range, washing machine, hvac) control boards cordless phone and answering machine power supplies metering, industrial control boards switching power supplies transformers lighting dimmers, ballasts ac motors part number lvr005 lvr008 lvr012 lvr016 lvr025 lvr033 lvr040 lvr055 hold currrent (a) 0.05 0.08 0.12 0.16 0.25 0.33 0.40 0.55 voltage rating (v ac ) 240 240 240 240 240 240 240 240 max. interrupt voltage (v ac ) 265 265 265 265 265 265 265 265 max. interrupt current 135v ac /240v ac (a) 20/1.0 20/1.2 20/1.2 20/2.0 20/3.5 20/4.5 20/5.5 20/5.5 hold 0.05 0.08 0.12 0.16 0.25 0.33 0.40 0.55 trip 0.12 0.19 0.30 0.37 0.56 0.74 0.90 1.40 current (a) 0.25 0.40 0.60 0.80 1.25 1.25 2.00 2.75 t-t-t (s) 15.0 15.0 15.0 15.0 18.5 18.5 26.0 26.0 min. 18.5 7.4 3.0 2.5 1.3 0.83 0.6 0.45 max. 31.00 12.00 6.50 4.10 2.10 1.24 0.97 0.73 post-trip resistance standard trip ( ? ) max. 65.0 26.0 12.0 7.8 3.8 2.6 1.9 1.45 typical power dissipation in the tripped state (w) 0.7 0.8 1.0 1.4 1.5 1.7 2.0 3.4 current ratings (a) max. time-to-trip resistance ( ? ) electrical characteristics (at 20? c) product notes: 1. a ptc device is not a fuse?t is a nonlinear thermistor that limits current. under a fault condition all ptc devices go into a high resistance state but not open circuit so hazardous voltage may be present at ptc locations. 2. the devices are intended for protection against occasional overcurrent or overtemperature fault conditions and should not be used when repeated fault conditions or prolonged trip events are anticipated. 3. for complete information and applications limitations, please visit us at www.circuitprotection.com/lvr/ new
worldwide headquarters 308 constitution drive, ms r21/2a menlo park, ca usa 94025-1164 tel (800) 227-7040 (650) 361-6900 fax (650) 361-2508 polyswitch, sibar, minismd, and nanosmd are trademarks of tyco electronics corporation. all information, including illustrations, is believed to be reliable. users, however, should independently evaluate the suitabi lity of each product for their application. tyco electronics makes no warranties as to the accuracy or completeness of the information, and disclaims any liability regarding it s use. tyco electronics?only obligations are those in the company s standard terms and conditions of sale for this product, and in no case will tyco electronics be liable f or any incidental, indirect, or consequential damages arising from the sale, resale, use, or misuse of the product. specifications are subject to change without notice. in a ddition, tyco electronics reserves the right to make changes-without notification to buyer-to materials or processing that do not affect compliance with any applicable specifi cation. ?2004 tyco electronics corporation. printed in usa. rcp0045.0304.5000 europe tel 32-16-351321 fax 32-16-351319 www.circuitprotection.com/lvr/ www.circuitprotection.com.hk (chinese) www.raychem.co.jp/polyswitch (japanese) japan tel 81-44-900-5110 fax 81-44-900-5140 asia pacific tel 852-2738-3401 fax 852-2735-1185 lvr devices 1 figure a figure b figure c figure d typical time-to-trip characteristics thermal derating curve part number lvr005s lvr005k lvr008s lvr008k lvr012s lvr012k lvr016s lvr016k lvr025s lvr025k lvr033s lvr033k lvr040s lvr040k lvr055s lvr055k fig. a c a c a c a c b d b d b d b d min. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- max. 8.3 (0.33) 8.3 (0.33) 8.3 (0.33) 8.3 (0.33) 8.3 (0.33) 8.3 (0.33) 9.9 (0.39) 9.9 (0.39) 9.6 (0.38) 9.6 (0.38) 11.4 (0.45) 11.4 (0.45) 11.5 (0.46) 11.5 (0.46) 14.0 (0.55) 14.0 (0.55) min. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- max. 10.7 (0.43) 12.9 (0.51) 10.7 (0.43) 12.9 (0.51) 10.7 (0.43) 12.9 (0.51) 12.5 (0.50) 13.8 (0.54) 17.4 (0.69) 18.8 (0.74) 16.5 (0.65) 19.0 (0.75) 19.5 (0.77) 20.9 (0.82) 21.7 (0.85) 21.7 (0.85) min. 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) 4.3 (0.17) max. 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) 5.8 (0.23) min. 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) 7.6 (0.30) max. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- min. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- max. 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) abcde dimensions in millimeters (inches) installation notes: lvr parts are not recommended for reflow soldering. installation where the lvr part is constrained may inhibit proper device fu nction. visit our web site or contact your local representative for additional information. typical time-to-trip of lvr devices at 20? typical thermal derating for lvr devices fault current (a) temperature (?) time-to-trip (sec) percent of rated current a = lvr005 b = lvr008 c = lvr012 d = lvr016 e = lvr025 f = lvr033 g = lvr040 h = lvr055
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